Abrading, buffing, or polishing drum



Nov'. 1, 1932. KUHNE 1,885,452

ABRADING, BUFFING, OR POLISHING DRUM Filed Feb. 25, 1929 M )8. /s /6 INVENTOR.

.EERN/(KRF. G. UH/YE BY ATTORNEYS Patented Nov. 1, 1932 UNITED STATES PATENT OFFICE IBEBNHARD G. KUHNE, or AKRON, onxo ABRADING, BUFFING, 0R POLISHING DRUM Application filed February 25, 1929. Serial No. 342,391. I

to provide as an abrading or like drum an ex pansible drum adapted to receive an endless cylinder of abrasive or like material about the same While collapsed preferably with a pad of yielding material between the drum and cylinder and adapted to be expanded to effectively secure the material smoothly and tightly on the drum surface, and also to provide a drum including pivoted sections and expanding means so balanced and the drum sections so held together that the drum will revolve truly at all operating speeds, whereby a uniform abrading or polishing action is secured and the material Wears even or uniformly over its entire surface.

The foregoing and other purposes are attained in the abrading or polishing drum construction illustrated in the accompanying drawing and described below. It is tobe understood that the invention is not limited to the specific form thereof shown and described. I

Of the accompanying drawing,

Figure 1 is an end elevation of a drum embodying the invention; and

Figure 2 is a diametral section on line 22 of Figure 1.

Referring to the drawing, the drum comprises a plurality of sect-ions 10, 10 mounted on a central hub 11 which may be secured upon a drive shaft (not shown). The hub 11 is provided with outwardly projecting apertured lugs or eyes 12, 12 upon which the sections 10 are pivoted by means of shafts 13, 13 extended through said lugs 12 and through inwardly extended apertured lugs or eyes 14, 14; on drum sections 10. The lugs 14-preferably are positioned between lugs 12, the co operating lugs 12 and 14 preferably bearing against each other and the apertures thereof being provided with elongated bushings 15, 15 extending through each pair of cooperating lugs 12 and 14: about shafts 13, the shafts 13 preferably being eccentrically mounted in the bushing. The cooperating lugs and pended claims. V

shafts are so placed to counterbalance each other in the drum construction.

The free ends of each drum section 10 are provided with inwardly projecting hooks 16 arranged to engage with corresponding outwardlyextendinghooks 17 on hub .11, the hooks beingundercut as shown so that centrifugal force developed by rotation ,of the drums tends to hold the hooks in engagement.

The drum expanding devices compriseeccentrics 18, 18 on shafts 13 cooperating with the outer ends of outwardly projecting lugs 19, 19 on hub 11 and with the rear faces 20 of the hooks 16 to expand the drum, the ec- 05 centrics being self-locking between said faces to hold the drum expanded.

The drum sections are of such length that sufiicient spaces may be provided asat 21, 21

.to permit the required contractionof the drum and plates 22 are secured to each section so as to overlie the spaces 21 and complete the periphery of the drum. 7

The abrading or polishing material in the form of an endless cylinder 23, either of 7 flexible or stifi material, is slipped onto the drum while collapsed, a resilient pad 24 of felt, rubber or the like preferably being first mounted on the drum. The drum is then expanded to the condition shown in the draw- 30 ings and is ready for use. The drum parts being balanced as shown and centrifugal force serving in addition to the'expanding eccentrics to hold the drum parts expanded in true circular form, the drum runs true and 35 the abrading or polishing action is uniform.

It will appear from the foregoing that a simple, effective abrading or. polishing drum has been provided. It will be understood that this drum can be employed for abrading or polishing metal, wood and other surfaces. Obviously modifications of the invention may be resorted to Without departing from the spirit thereof or the scope of the ap- WVhat is claimed is 7 1. An expansible abrading orpolishing drum construction comprising a hub, drum sections pivoted on the hub, the pivots for the sections including shafts, the sections bev100 ing arranged so that the free end of one section is-adj acent the pivoted end of another section, interengaging hook means on the hub and the free ends of the sections, said hook means being adapted to be held in engagement by centrifugal force when the drum is rotated, and means for expanding the drum comprising eccentrics on said shafts, adapted to cooperate with the outer faces of lugs on the hub and with the rear faces of the hooks on the drum sections to lock the drum in expanded condition, the sections, pivots, hooks and the drum expanding means being disposed at diametrically opposlte points so I as to counterbalance each other.

2. An expansible abrading or polishing drum construction comprising a hub, drum sections pivoted on the hub, the pivots for the sections including shafts, the sections being arranged so that the free end of one section is adjacent the pivoted end of another section, interengaging hook means on the hub and the free ends of the sections, said hook means being adapted to beheld in engagement by centrifugal force when the drum is rotated, and means for expanding the drum comprising eccentrics on said shafts adapted to cooperate with the outer faces of lugs on the hub and with the rear faces of the hooks on the drum sections to lock the drum in expanded condition.

3. An expansible abrading or polishing drum construction comprising a hub, drum sections pivoted on the hub, the pivots for the sections including shafts, the sections be ing arranged so that the free end of one section is adjacent the pivoted end of another section, interengaging hook means on the hub and the free ends of the sections, said hook means being adapted to be held in engagement by centrifugal force when the drum is rotated, and means for expanding the drum comprising eccentrics on said shafts adapted to cooperate with the free end of the drum sections to lock the drum in expanded condition, the sections, pivots, hooks and the drum expanding means being disposed at diametrically opposite points so as to counterbalance each other.

4. An expansible abrading or polishing drum construction comprising a hub, drum sections pivoted on the hub, the pivots for the sections including shafts, the sections being arranged so that the free end of one section is adjacent the pivoted end of another section, interengaging hook means on the hub and the free ends of the sections, said hook means being adapted to be held in engagement by centrifugal force when the drum is rotated, and means for expanding the drum comprising eccentrics on said shafts adapted to cooperate with the free end of the drum sections to lock the drum in'expanded condition.

5. An expansible abrading or polishing BERNHARD G. KUHNE. 

